Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 01, 2012	Apr. 03, 2011
Cash flows from operating activities:
Net income	$ 25,667	$ 22,312
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation	5,204	4,514
Amortization	913	451
Stock-based compensation	3,613	2,789
Income taxes payable, net	1,357	270
Deferred income taxes	(3,282)	767
(Increase) decrease, net of acquisitions, in:
Receivables	(28,249)	6,696
Inventories	(11,247)	(16,753)
Other assets	(2,834)	(6,848)
Increase (decrease), net of acquisitions, in:
Accounts payable	3,576	1,492
Accrued payroll liabilities	(22,634)	(7,411)
Accrued warranty reserves	(83)	916
Deferred revenue	(148)	1,864
Accrued restructuring, reorganization, relocation and severance	48	(2,009)
Other liabilities	(4,110)	660
Net cash (used in) provided by operating activities	(32,209)	9,710
Cash flows from investing activities:
Decrease (increase) in restricted cash	16,957	(1,824)
Acquisition of property, plant and equipment	(6,189)	(1,870)
Payments for acquisitions, net of cash acquired	(30,171)	0
Purchase of investments in marketable securities	(50,012)	0
Redemption of investments in marketable securities	26,638	66,834
Other	(319)	(464)
Net cash (used in) provided by investing activities	(43,096)	62,676
Cash flows from financing activities:
Withholding taxes paid on issuance of vested restricted stock units	(1,366)	(585)
Proceeds from exercise of stock options and employee stock purchases	2,804	10,008
Excess tax benefit for share based payment arrangements	433	0
Repurchases of common stock	(818)	0
Net cash provided by financing activities	1,053	9,423
Effect of exchange rate changes	6,168	7,839
(Decrease) increase in cash and cash equivalents	(68,084)	89,648
Cash and cash equivalents:
Beginning of period	320,361	277,617
End of period	252,277	367,265
Supplemental Cash Flow Information:
Cash paid for income taxes, net	7,807	6,756
Cash paid for interest	322	273
Increase in fixed assets related to transfers from inventories	$ 8,839	$ 1,623